Phonograph tone chamber



Feb. 20, 1923. 1,445,915. A. SCHONHORST. PHONOGRAPH TONE CHAMBER.

FILED APR. 11. I921- flgj. I

' JNVENTOR. fl usf Jc/ranhonsf ATTORNEYS.

Patented Feb. 20, 1923. i

UNITED STATES PATENT OFFICE.

AUGUST SCHONHORST, OF ALTADENA, CALIFORNIA. PHONOGRAPH TONE CHAMBER. Application filed April 11, 1921. Serial No. 480,371.

To all 'whom it may concern: In the chamber section adjacent the Be it known that 1, AUGUST SoHoNHoRsT, elbow are two diaphragins 8 of thin resilient a citizen of the United States, and resident material, preferably mica. These dia- 55 of Altadena, in'the county-of Los Angeles, phragms are angularly disposed to one State of California, have invented new and another and intersect as s' own in Fig. 3. useful Improvements in a Phonograph Tone They do not close the chamber, but have a. Chamber, of'which the following is a specidirection which in general is axial to the fi tion, chamber- They may be secured in position 60 This invention relates to sound reproduc; by any suitable means, such as grooved strips 10 ing instruments. such as phonographs, and 9 secured on the upper and lower walls, the

pertains especially to the tone chamber. mica'being slipped into the grooves. Theprimary object of this invention is to The operation of the chamber is obvious.

produce a device of this character which will Sound waves pass down through the .elbow 65 improve the volume and quality of the re- 4 and into the tone hamber section 5, im-

produced sound so that the original tone is pinging upon the mica diapragms 8, but reproduced unimpaired. Another object of sliding thereover. The diaphragms are this invention is to provide details of 0011- caused to vibrate and intensify the tone. As struction whereby a simple compact and inthe waves advance toward the mouth of the 70 expensive structure is obtained. horn. the walls of the chamber assist in in- These objects together with other objects tensifying the tone. Finally the sound and corresponding accomplishmentsare obwaves pass through the auxiliary amplifiers,

tamed by means of the embodiment of my being further intensified. All of the parts invention illustrated in the accompanying of the chamber are so arranged, that no vi- 7 I drawing, in which: brations foreign to the natural quality of ig. 1 is a vertical section of my device," the tones are produced. Furthermore, none Fig. 2 is a frontelevation looking at the of the elementary vibrations of the sounds mouth of the tone chamber; and Fig. 3 is are intensified to any degree greater than a fragmentary section as seen on the line others. There are no obstructions to pocket 80 33 of Fig. 1. the air and confuse the sound. The tone arm of the phonograph is adapt- What I claim is: N

ed to be connected to the elbow 4 of the tone 1. A device of the character described chamber. The entire tone. chamber accordcomprising a main outwardly flaring chaming to my invention is preferably constructber, and a plurality ofauxiliary chambers 85 ed of wood, and I prefer to construct the of structure corresponding to said main elbow section 4 of maple. Extending from chamber and disposed across said main the elbow is the chamber section of the dechamber in proximity to the mouth thereof. vice indicated by 5. This chamber section 2. A device of the character described ares outwardly in the usual manner and is comprising a main'outwa-rdly flaring chain- 90 preferably made of spruce, the walls being her, a partition wall extending across said 40 graduated in thickness decreasing from the main chamber in proximity to the mouth inner to the outer end of the chamber. This thereof and having a plurality of openings provides for increasing vibration of the for auxiliary chambers, and a, plurality of chamber Walls towards the mouth of the auxiliary chambers mounted in said parti- 95 chamber. tion wall and supported solely by said wall; Extending transversely across the chamsaid auxiliary chambers corresponding in her adjacent the month thereof is a partition structure to said main chamber.

wall 6 having formed therein a number of In witness that I claim the foregoing I openings, in which are disposed auxiliary have hereunto subscribed my name this'EZnd 1 0 amplifiers 7. These amplifiers are preferday of April, 1921, ably made of spruce, flare outwardly, and the walls thereof diminish progressively in AUGUST SCHONHORST. thickness toward the mouth ends thereof. 

